Jesus is even more explicit about this fact when He instructs those in his own synagogue...
And when the sabbath day was come, he began to teach in the synagogue: and many hearing him were astonished, saying, From whence hath this man these things? and what wisdom is this which is given unto him, that even such mighty works are wrought by his hands? Is not this the carpenter, the son of Mary, the brother of James, and Joses, and of Juda, and Simon? and are not his sisters here with us? And they were offended at him. But Jesus, said unto them, A prophet is not without honour, but in his own country, and among his own kin, and in his own house." -- Mark 6:1-4"And he went out from thence, and came into his own country; and his disciples follow him.
Even those mentioned from His own house, his mother and his brothers and sisters, did not yet recognize Him as God.
Given the events recorded in the infancy narratives in Matthew amd Luke. hos mother must have had a clue. Or don’t you believe these are true?